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Canon Anti-Fog Eyepiece AE-B1 are specifically designed to work with Canon 15x50 IS All Weather Binoculars and Canon 18x50 IS All Weather Binoculars. This Canon binocular accessory is built with a high attention to detail and quality. AntiFog EyePiece from Canon uses specially treated advanced-process glass, which prevents condensation or fogging. This binocular accessory designed for use in warm and humid or cold weather when fogging is most likely to occur, and attaches easily to reduce condensation and help you maintain a clear view of your subject.